Imagine a hypothetical situation in which you had the ability to place, and the time to observe, a delicately placed household LED flashlight in the middle of outer space. Would, given enough time, the flashlight propel itself forward? Yes, but very slowly. Even though it is massless, light has momentum; and if a beam of … Continue reading If you placed a flashlight in space, would it propel itself forward by “shooting out” light?
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